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Yes, it is possible to change an embedded Hibernate entity to be mandatory by adding the @NotNull annotation on the corresponding field. For example:

@Entity
public class Customer {
    @Embedded
    @NotNull
    private PersonalInfo personalInfo;
}

@Embeddable
public class PersonalInfo {
    @NotNull
    private String firstName;
    @NotNull
    private String lastName;
}

In the above example, the embedded entity PersonalInfo is made mandatory by adding the @NotNull annotation to its fields firstName and lastName. This ensures that whenever a Customer entity is persisted or updated, it must have a non-null PersonalInfo object that also has non-null firstName and lastName values.